There's an important difference between offering suggestions for improved process and calling out someone's process as unacceptable. It's awfully tempting in any pursuit to fall into the "right/wrong" dichotomy when it really doesn't apply. Offer suggestions for improvement. Of course. Offer information. But don't tell someone their dumping on a yeast cake is unacceptable because there are better practices, or using extract is unacceptable because there are better practices, or using dry yeast is unacceptable because there are better practices, or using 5.2 buffer is unacceptable because there are better practices, or regulating your Ranco or Johnson controller with the bulb in the freezer is unacceptable because there are better practices (a bulb), or.... there are many types of home brewers, with many types of personalities, capabilities and objectives. There is a vast array of practices all of which are 'acceptable' depending upon those personalities, capabilities and objectives. Make suggestions, offer information, and those who are inclined will embrace them. Those who aren't needn't be told that their pursuit of their hobby is wrong.